Windows Media 8.0 is the container, it seems the encoder is Lavf58.10.100. Maybe try another encoder. (EDIT: it's like MP4, MP4 is not an encoding format, it's a simple container that may contains video files encoded with different encoders).
I have just a small addition to scrolling global values/string. If your global val. sheet contains over 200vals. scrolling is getting slowed down with a small lag (Properties panel where u add values and strings). I am sure I had not this issue in the past. However I updated win 7 to 10 (maybe win. elements thing?) or it's in the latest versions of CTF. Can't tell. While it is not a problem, it's a bit unpleasant. - Looking forward F3. Thanks for frequent updates of 2.5 btw.
Would "win32/uwasson.a!ml" be a false positive?
Downloads in Community passport for Fusion Developer are still showing me 292.26 as the beta version. Is the 292.27 just the basic version so far?
It seems to me that an mp4 object is in preparation
It's really great how much better Fusion becomes every year. So much of my workflow and techniques nowadays depend on things that wouldn't have even been possible (or at least would have been more complicated and/or tedious) back in 2014. I personally don't need 4GB file support at the moment, but I'm very glad it's there now if I ever need it.
EDIT: oh I see you use the Steam version (build 292.26), some anti-virus programs have been reporting false positives for this build. The build 292.27 will be available as beta for Steam too soon.